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A certain rectangle has perimeter 54. If the ratio of the length of the rectangle to the width is 5 to 4, what is the length of
A certain rectangle has perimeter 54. If the ratio of the length of the rectangle to the width is 5 to 4, what is the length of
admin
2009-05-19
105
问题
A certain rectangle has perimeter 54. If the ratio of the length of the rectangle to the width is 5 to 4, what is the length of the rectangle?
选项
A、30
B、27
C、24
D、18
E、15
答案
E
解析
一长方形的周长等于54,其长宽比为5:4,问该长方形的长为多少?
解:本题的正确答案为(E)。设该长方形的长和宽分别是5x,4x,由题意可得:(5x+4x)×2=54 → x=3, 5x=15
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